期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 45, 期 51, 页码 27254-27262出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.07.094
关键词
Oxygen reduction; Core-shell catalyst; Fuel cell; Compressive strain; Stabilizing effect
资金
- National Natural Science Foundation of China [21306144]
- Natural Science Foundation of Hubei Province [2016CFB461]
The scarcity and poor long-term stability of Pt has greatly hindered its commercial application as oxygen reduction reaction (ORR) catalyst. In this work, carbon-supported Pd9Au1 alloy particles with a Pd/Au molar ratio of 9:1 synthesized by using an ethylene glycol-based reduction method were used to catalyze ethanol oxidation to coat Pd9Au1 core with Pt atomic layers to synthesize Pd9Au1@Pt/C catalyst. Physical characterization shows that the as-synthesized Pd9Au1@Pt/C catalysts present a well-defined core-shell structure and the surface Pt layers can be well controlled by tuning the amount of Pt precursor added during synthesis. Electrochemical characterization shows that among the synthesized catalysts Pd9Au1@Pt-2/C with 2 atomic Pt layers exhibits the best activity and excellent stability for ORR, as evidenced by its even increased half-wave potential after 10000 potential cycles between 0.6 and 1 V in O-2-saturated 0.1 M HClO4 solution. This enhanced ORR activity and stability of Pd9Au1@Pt-2/C catalyst can be attributed to the compressive strain and stabilizing effect of Pd9Au1 core on Pt shell. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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